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(N 2 SheetsSheet 1.

J. BBU-DEBER & 0. 0. BURDIGT.

MACHINE FOR FORGING BOLT BLANKS. 7 No. 310,646. Pate njz ed Jan. 13, 1 885.

2 SheetsSheet 2 J. BRUDERER & 0. 0. BURDIGT, MACHINE FOR FORGING BOLT BLANKS; No. 310,646. Patented Jan. 13, 1885.

(No Model.)

NITED STATES T FICEL JOHN BRUDERER, OF PHILADELPHIA, PENNSYLVANIA, AND ORRIN CLARK BURDIOT, OF BUFFALO, NEW YORK, ASSIGNORS TO PLUMB, BURDIO'I & BARNARD, OF BUFFALO, NEW YORK.

lVlACHlNE FOR FORGING BOLT-BLANKS.

SPECIFICATION forming part of Letters Patent No. 310,646, dated January 13, 1885.

To aZZ whom it may concern.-

Be it known that we, JOHN BRUDERER, a citizen of Switzerland, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, and ORRIN CLARK BURDIcT, of Buffalo, in the county of Erie and State of New York, have made an invention of certain-new and useful Improvements in Forging-Machines for Forging Bolt-Blanks, the Bars of Monkey- \Vrenches, and Similar Articles; and we do hereby declare that the following, in connection with the accompanying drawings, is'a full, clear, 'and exact description and specification of the same.

The object of our invention is, principally, to forge protuberant heads upon bars or rods of iron-such, for example, as the angular heads of machine-bolts when forged out of blanks of the size of their stems; and the inven-- tion consists of certain combinations of me chanical devices, which are recited-in detail in the claims at the close of this specification.

In order that the invention may be fully understood, We have represented in the ac- 2 5 companying drawings, and will proceed to describe, the principal parts of a machine embodying our invention in the best mode devised by us up to the date of this-specification, it being understood that the mechanism 0 of said machine may be greatly varied, as circumstances or the views of different builders or users render expedient.

Figure 1 of the said drawings represents a partial side view of the said machine, and

3 5 Fig. 2 represents a partial plan of the same. Figs. 3 to 6, inclusive, represent parts of the same detached from the residue and denoted by the same letters as they are in Figs. 1 and 2.

The machine to which we have applied our 0 invention with success is that described and represented in the patent to O. C. Burdict, No. 168,135, dated the 28th day of September, A. D. 1875, and such parts of the machine as are not represented in our drawings and de- 5 scribed herein are to be understood as to be constructed as they are described and represented in said Burdict patent. The blank upon which the head is to be forged is applied to a blank-carriage, H, by means of which it is moved forward between lateral forgingtools to the position to be operated upon by forged by the combined action of the lateral forging and heading tools. Two lateral forging-tools, a a, are represented in the drawings, and we prefer to use two others, operating crosswise of said first two, (a a,) as in the said machine described in said Burdict pa ent. Two heading-tools, E E, are used in .our machines, the one, E, to upset the head in conoidal or globular form, and the second, E, to impart the finished form to the head. These two heading-tools are secured to a rocking die-holder, A, which in this example is fitted with lateral trunnions, a, which turn in sockets formed in the cheeks of the head of a reciprocating piston, D. This piston is fitted to move endwise in guides secured to the bed-plate of the machine, so as to move with the die-holder and heading-tools toward and from the blank-carriage. The piston is moved to and fro by means of a revolving crank-shaft, F, to which the pulley fly-wheel F is secured, the connection between the crank-shaftF and the piston being a togglerod, G.

In order to insure the requisite strength, the rocking die-holder A has a circular periphery, which bears in a'curved seat in the head of the piston, so that the strain is borne by the body of the shifting die-holder, and the trunnions are relieved in whole or in part of the strain of heading the bolt or other article. The two heading-tools E E are caused to operate upon the blank in succession by shifting the position of the die-holder A relatively to the piston G, which carries it, and the shifting being effected by causing the die-holder to turn upon the axis of its trunnions. In order that the rocking die-holder may be turned on its axis to bring the heading-toolsin succession into their positions for operating on the blank, and without affecting materially the reciprocating movement of the piston D, one of the trunnions of the die-holder is fitted with a crank, 0, which is connected by a linkbar, 0, with one of the arms of a bell-crank, G, which is pivoted to the piston D. The other arm of the bell-crank has a pin, 0 which is arranged to traverse in the .slot of a movable guide, B, which is moved up or down, as required, to turn the be1l-crank and the rock" ICO ing die-holder in one direction or the other. Thus, when the first heading-tool, E, is in its acting position, as in Fig. 8, the movable guide is in its highest position, as in Fig. 3; but by depressing the guide, as in Fig. 1, the bell-crank and rocking die-holder are partially turned so as to occupy the positions represented in Fig. 1, and thereby turning the first heading-tool out of line with the boltblank (2, and turning the second heading-tool into line therewith, as represented in Fig. 1.

In the machine represented in the drawings the blank-carriage H is caused to present the blank for the action of the heading-tools and lateral forging-tools, to hold it stationary during their operations or blows, and then to withdraw the headed blank so that it may be removed from the blank-carriage and a new unheaded blank may be substituted in its place. The first heading operationis eiiected while the first heading-tool, E, is in its heading position, as in Fig. 3. Then it is turned out of its heading position, and the second heading-tool is turned into its heading position, as in Fig. 1, and the remaining heading operations or blows are effected by it. The holding of the rocking die-holder in its position for the operation of the first headingtool, the turning of the die-holder to bring the second headingtool into its position for operating upon the blank, the holding of the second heading-tool in its heading position while the requisite number of blows are struck by it, and the turning of the die-holder backward so as to place the first heading-tool in position for operating upon the next new blank are effected by the cam J, which may be termed the shifting-cam, and which operates through the elbow-lever J upon the movable guide B, raising and lowering that guide and holding it stationary at the required times. The elbow-lever J is fitted with a friction-wheel, which runs in the groove of the shifting-cam J, and the longer arm of the elbow-lever is fitted with a second frictionwheel, which is received in a slot formed in the shank of the movable guide B. The shifting-cam is fitted to revolve upon astud, j, projecting from the frame of the machine, and it has a cog-wheel, K, secured to it, which is connected by a cog-wheel, shaft, and pinions, K K with a cog-wheel, K, secured to the crank-shaft F of the machine, so that the said shifting-cam is turned once for every eleven revolutions of the crank of the machine. The blankcarriage is moved to present the blank to the lateral and heading dies, is retained in its position while the head of the blank is being forged, and is then withdrawn, so that the headed blank may be removed and a new blank may be put in its place.

The mechanism for moving the blank-earriage is substantiallythe same as that of the machine represented and described in the said Burdict patent, the carriage being connected by a toggle-link, P, with the arms of a rockshaft, N. One end of the said rock-shaft has a vibrating frame, 0, fitted upon it and connected by a connecting-rod, t, with a crank-pit, S, secured to the crank-shaft of the machine, so that the said frame is caused to vibrate continuously asthe crank-shaft of the machine revolves. The rock shaft, which moves the blank carriage, is engaged with and disengaged from the rocking frame by means of the double-headed pawl 10 10, which turns upon a pivot of the vibrating frame, and is fitted tov engage with either of two teeth, 0 1;, formed upon ahub, T, secured to the carriage rockshaft N. Vhen the pawl is turned so as to engage with the tooth o, the movement of the pawl by the vibration of the vibrating frame turns the carriage rock-shaft so as to advance the blank carriage, and when the pawl is turned so as to engage with the tooth a, the movement of the pawl by the vibrating frame turns the carriage rock-shaft backward, so as to withdraw the blank-carriage. The pawl is held in either position, and is moved from one position to the other by the action of the rim-cam J, which in this case forms part of and revolves with the shifting-cam J, and operates upon the lever J, which is connected by a rod, t, with an arm secured to the pivot of the double-headed pawl w w. The lever J 3 has an arm, which is fitted with a frictionwhcel upon which therim-cam J acts, and it is held in contact with the rim-cam by the action of the spring f. As the shifting-cam J (which turns and holds the turning die-holder) and the rim-cam (which determines the movement of the blank-carriage and the time during which it remains in its advanced position) are connected together, the blank-carriage will always be advanced at the proper time to have the bolt-blank receive its first heading blow from the first heading-tool, E, and the blank-carriage will be held in its advanced position while the blank receives the blow of the second heading tool, E, after which the blank-carriage will withdraw the headed blank, and will remain in its withdrawn position a certain length of time, determined by the form of the rim-cam J", thus giving time for the attendant to remove the headed blank and apply an unheaded blank to the carriage. By changing the gear-wheels which connect the cams with the crank-shaft of the machine, and by changing the forms of the cams, the blank to be headed may be presented for alonger or shorter period to the action of the dies and heading-tools.

In order that the rocking die holder and the heading-tools may be held securely in their operating positions during their action upon the blank, the fixed guide I is provided. It is arranged in this case at the outer side of the movable guide B, and the pin a of the bell-crank is long enough to pass through the slot of the movable guide B and engage with the fixed guide I. \Vhen the bellcrank is turned down, as in Fig. 1, and the headingtools are moved forward, the projecting pin a of the bell crank passes beneath the fixed guide I, which prevents the bell-crank from turning upward, and therefore holds the rock ing die-holder and its heading-tools firmly in the positions which they then havethat is, with the second heading-tool, E, in operating position. When the bell-crank is turned up and the heading-tools are moved forward, the projecting-pin c of the bell-crank passes over the fixed guide I,which then prevents the bellcrank from turning downward, and therefore holds the rocking die-holder and its headingtools firmly in the positions they then have with the first heading tool, E. in its operating position. The fixed guide is shorter than the stroke of the piston D, which carries the heading-tools and the bellcrank 0; hence, when the piston is withdrawn about half its stroke the fixed guide no longer holds the arm 0 of the rock-shaft, and the rock shaft may be turned to shift the positions of the heading-tools by the action of the movable guide B and the shifting-cam J.

In order that the two heading-tools may be readily applied to and removed from the shifting die-holder, they are applied and secured as represented more particularly in Fig. 4- that is to say, the second heading-tool has a round shank, e, which is received directly in a socket in the turning die holder A, and it is secured in this socket by means of a movable cup, 6, which forms a socket for the first heading-tool, E, and has its inner end projected into a slot formed in the second heading-tool, E.

The first heading-tool is held in its socket in the cup 0 by means of a set-screw, e whose point passes through a hole in the said cup and is engaged in the shank of the first headheading-tool, both heading-tools are secured to the turning die-holder by the action of a single set-screw, 6 which is in a position to be readily got at when the heading-tools are to be loosed for removal or are to be fastened to the turning die-holder.

The parts of the machine which are not represented in the drawings and have not been specially described are constructed as set forth in the said Burdict patent, No. 168,135.

In the machine thus described the shiftingcam and its connections with the movable guide, bell-crank, rod, and crank, secured to the shifting die-holder, constitute the devices for shifting the die-holder so as to place each of its dies in its operating position at the required time. WVhile we have used these devices for the purpose, we do not limit our invention to them, as other devices may be used for the same purpose.

In order to relieve the shifting devices of strain during the heading operations, we make the groove of the shifting-cam J of the form to turn the rocking die-holder a little more than a quarter of a revolution, and we construct the rocking die-holder with shoulders s 8, one of which abuts against a corresponding shoulder, 00, on the head of the piston D when each heading-tool is in its operating position, so that said abutting shoulders receive the strain.

As the attendant may require a greater or less space of time to remove the forged blanks from the blank-carriage and to apply a new blank, we sometimes find it expedient to construct the machine so that it can be readily stopped and started. For this purpose we arrange the fiy-wheel F to revolve loose upon the crank-shaft F, and we connect it with the crank-shaft F by means of a clutch, M, Fig. 6, which can be thrown into and out of gear by means of a lever operated by a treadle or otherwise.

The combinations hereinafter recited in the second, third, fourth, and sixth claims are restricted to that kind of a shifting die-holder which is rocked or moved in alternately opposite directions for the purpose of changing the positions of the dies, that kind of a dieholder being specially adapted to those combinations. In the combinations recited in the first, fifth, and seventh claims a die-holder constructed to be turned intermittently, but always in the same direction, may be substituted for a rocking die-holder.

We claim as our invention- 1. The combination, substantially as before set forth, of the reciprocating piston and its shifting die-holder with the movable blankcarriage which presents the blanks to the tool carried by said shifting die-holder.

2. The combination, substantially as before set forth, of the reciprocating piston and its rocking die-holder with lateral forging-dies.

3. The combination, substantially as before set forth, of the reciprocating piston, the rock.- ing die-holder, the bell-crank connected with said die-holder, and the movable guide by which said bell-crank is controlled.

4.. The combination, substantially as before set forth, of the reciprocating piston, the rocking die-holder, and the fixed guide for locking the die-holder in its several positions.

5. The combination, substantially as before set forth, of the shifting die-holder, two heading-dies, and a single set-screw.

6. The combination, substantially as before set forth, of the reciprocating piston fitted with shoulders, and the shifting die-holder fitted with shoulders.

7. The combination, substantially as before set forth, of the reciprocating piston constructed with a curved seat for the shifting dieholder, with the shifting die-holder constructed with a curved periphery to bear in said seat of said piston.

In witness whereof we have hereto set our hands this 13th day of February, A. D. 1884.

JOHN BRUDERER. ORRIN CLARK BURDIGT.

Witnesses:

ISRAEL HEcH'r, PHILIP F. SNYDER.

IIO 

